jquery右下角弹出广告

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title></title>

        <script src="jquery-3.5.1.min.js" type="text/javascript" charset="utf-8"></script>

        <script type="text/javascript">
            // 入口函数
            $(document).ready(function() {
                var jqSpan = $("span");
                var jqAd = $(".ad");

                jqAd.slideDown("slow");

                jqSpan.click(function() {
                    jqAd.fadeOut(1000);
                })
            });
        </script>

        <style type="text/css">
            .ad {
                position: fixed;
                right: 0;
                bottom: 0;
                width: 230px;
                height: 220px;
                background-color: red;
                /* display: none; */
            }

            .ad span {
                position: absolute;
                right: 0;
                top: 0;
                width: 40px;
                height: 18px;
                background-image: url(close.jpg);
                cursor: pointer;
            }
        </style>
    </head>
    <body>
        <div class="ad">
            <span></span>
        </div>
    </body>
</html>

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